#!/usr/bin/env ruby

lib = File.expand_path(File.dirname(__FILE__) + '/../lib')
$LOAD_PATH.unshift(lib) if File.directory?(lib) && !$LOAD_PATH.include?(lib)

require 'em-proxy'
require 'optparse'

ARGV << '--help' if ARGV.empty?

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: em-proxy [options]"

  opts.on("-l", "--listen [PORT]", Integer, "Port to listen on") do |v|
    options[:listen] = v
  end

  opts.on("-d", "--duplex [host:port, ...]", Array, "List of backends to duplex data to") do |v|
    options[:duplex] = v
  end

  opts.on("-r", "--relay [hostname:port]", String, "Relay endpoint: hostname:port") do |v|
    options[:relay] = v.split(":")
  end

  opts.on("-v", "--verbose", "Run in debug mode") do |v|
    options[:verbose] = v
  end
end.parse!


Proxy.start(:host => "0.0.0.0", :port => options[:listen] , :debug => options[:verbose]) do |conn|
  conn.server :relay, :host => options[:relay].first, :port => options[:relay].last.to_i

  options[:duplex].each_with_index do |backend,i|
    hostname, port = backend.split(":")
    conn.server "backend_#{i}".intern, :host => hostname, :port => port.to_i
  end if options[:duplex]

  conn.on_data do |data|
    data
  end

  conn.on_response do |server, resp|
    resp if server == :relay
  end
end